Organochromium/metallocene combination catalysts for producing bimodal resins

a technology of bimodal resins and organic compounds, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of significant challenges in catalyst development, not a single support capable of activating both types of catalysts, etc., to increase the acidity of solid oxides and high surface area

Active Publication Date: 2007-01-16
CHEVRON PHILLIPS CHEMICAL CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is not a single support capable of activating both types of catalysts.
Thus, there remain significant challenges in developing catalysts that can provide custom-made polymers with a specific set of desired properties.

Method used

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  • Organochromium/metallocene combination catalysts for producing bimodal resins
  • Organochromium/metallocene combination catalysts for producing bimodal resins
  • Organochromium/metallocene combination catalysts for producing bimodal resins

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of the Fluorided Silica-Alumina Support

[0244]Silica-alumina was obtained from Grace Davison, a division of W.R. Grace and Company, as MS 13-110 containing about 13% alumina and about 87% silica. The silica-alumina had a pore volume of about 1.2 cc / g and a surface area of about 450 m2 / g. The silica-alumina was impregnated with about 0.1 g ammonium bifluoride per gram of the support. The ammonium bifluoride was applied in the form of an aqueous solution. The resulting damp powder was dried for about 16 hours at about 110° C. Ten grams of the fluorided silica-alumina was placed in a 1.75 inch quartz tube fitted with a sintered quartz disk at the bottom. Air or nitrogen, dried by passing through a 13× molecular sieve column, was blown upward through the disk at a linear rate of about 1.6 to about 1.8 standard cubic feet per hour. An electric furnace around the quartz tube was then turned on and the temperature was raised at about 400° C. / hr to 450° C. and held at about 450° ...

example 2

Preparation of the Dicumene Chromium Catalyst

[0245]Fluorided silica-alumina was prepared as described in Example 1. The fluorided silica-alumina was found to have a surface area of about 300 m2 / g and a pore volume of about 1.1 cc / g. Dicumene chromium (0) was impregnated onto this fluorided silica-alumina support from a heptane solution in an amount equal to 1 wt % chromium based on the weight of the support. The heptane was then evaporated off the support under an atmosphere of flowing nitrogen, while the catalyst was warmed to about 50° C.

example 3

Polymerization Run Using the Dicumene Chromium Catalyst

[0246]To a dry 2.2 L steel reactor at about 90° C. was charged 0.5827 g of catalyst prepared as in Example 2. The reactor was equipped with a marine stirrer running at about 400 rpm and was surrounded by a steel jacket containing boiling methanol with a connection to a steel condenser. The boiling point of the methanol was controlled by varying nitrogen pressure applied to the condenser and the jacket, which permitted temperature control to within about 0.5° C. The run was allowed to proceed at an ethylene pressure of about 550 psig, a temperature of about 90° C., using isobutane as a diluent. As ethylene was consumed, more ethylene flowed in to maintain the pressure. The activity was noted by recording the flow of ethylene into the reactor to maintain the set pressure. After the allotted time, the ethylene flow was stopped and the reactor slowly depressurized and opened to recover a granular polymer powder. In all cases the rea...

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Abstract

This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a supported catalyst composition. In one aspect, the present invention encompasses a catalyst composition comprising the contact product of at least one metallocene compound, at least one organochromium compound, at least one chemically-treated solid oxide, and at least one organoaluminum compound.

Description

TECHNICAL FIELD OF THE INVENTION[0001]This invention relates to the field of organometal compositions, olefin polymerization catalyst compositions, methods for the polymerization and copolymerization of olefins using a catalyst composition, and polyolefins.BACKGROUND OF THE INVENTION[0002]There exists a constant search to develop new olefin polymerization catalysts, catalyst activation processes, and methods of making and using catalysts, that will provide enhanced catalytic activities and polymeric materials tailored to specific end uses. Mono-1-olefins (α-olefins), including ethylene, can be polymerized with catalyst compositions employing titanium, zirconium, vanadium, chromium or other metals, impregnated on a variety of support materials, often in the presence of cocatalysts. These catalyst compositions may be useful for both homopolymerization of ethylene, as well as copolymerization of ethylene with comonomers such as propylene, 1-butene, 1-hexene, or other higher α-olefins.[...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B01J31/32B01J37/00C08F297/04C08F4/22C08F4/44
CPCC08F10/00C08F4/63904C08F4/69C08F4/65916C08F2420/02C08F110/02C08F4/65925C08F2420/01C08F4/65927C08F4/6592C08F2500/01C08F2500/03C08F2410/07
Inventor MCDANIEL, MAX P.BENHAM, ELIZABETH A.JENSEN, MICHAEL D.COLLINS, KATHY S.MARTIN, JOEL L.HAWLEY, GIL R.
Owner CHEVRON PHILLIPS CHEMICAL CO LP
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